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Investment Securities Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Available For Sale And Held For Maturity Securities [Table Text Block] | The amortized cost, gross unrealized gains and losses and estimated fair values for available-for-sale and held-to-maturity securities by major security type at December 31, 2018 and December 31, 2017 were as follows (in thousands):
December 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 201,380 |  |  | $ | 504 |  |  | $ | (3,235 | ) |  | $ | 198,649 |
Obligations of states and political subdivisions | 193,195 |  |  | 1,224 |  |  | (1,840 | ) |  | 192,579 |
Mortgage-backed securities: GSE residential | 304,372 |  |  | 486 |  |  | (6,186 | ) |  | 298,672 |
Other securities | 2,278 |  |  | 96 |  |  | — |  |  | 2,374 |
Total available-for-sale | $ | 701,225 |  |  | $ | 2,310 |  |  | $ | (11,261 | ) |  | $ | 692,274 |
Held-to-maturity: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 69,436 |  |  | $ | — |  |  | $ | (1,527 | ) |  | $ | 67,909 |
December 31, 2017 |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 115,796 |  |  | $ | 8 |  |  | $ | (2,034 | ) |  | $ | 113,770 |
Obligations of states and political subdivisions | 165,037 |  |  | 2,254 |  |  | (1,025 | ) |  | 166,266 |
Mortgage-backed securities: GSE residential | 295,778 |  |  | 493 |  |  | (2,460 | ) |  | 293,811 |
Trust preferred securities | 2,893 |  |  | — |  |  | (345 | ) |  | 2,548 |
Other securities | 2,039 |  |  | 145 |  |  | — |  |  | 2,184 |
Total available-for-sale | $ | 581,543 |  |  | $ | 2,900 |  |  | $ | (5,864 | ) |  | $ | 578,579 |
Held-to-maturity: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 69,332 |  |  | $ | 103 |  |  | $ | (978 | ) |  | $ | 68,457 |
Trust preferred securities at December 31, 2017, is a trust preferred pooled security issued by First Tennessee Financial (“FTN”). The unrealized loss of this security, which had a maturity of twenty years, was primarily due to its long-term nature, a lack of demand or inactive market for the security, and concerns regarding the underlying financial institutions that have issued the trust preferred security. This security was sold during 2018. See the heading “Trust Preferred Securities” below for further information regarding this security.
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] | As described above, the Company’s investments in trust preferred securities experienced fair value deterioration due to credit losses but were not otherwise other-than-temporarily impaired. The following table provides information about those trust preferred securities for which only a credit loss was recognized in income and other losses were recorded in other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 (in thousands).
| Accumulated Credit Losses as of December 31:
| 2018 |  | 2017 |  | 2016
Credit losses on trust preferred securities held: |  |  |  |  |
Beginning of period | $ | 1,111 |  |  | $ | 1,111 |  |  | $ | 1,111 |
Additions related to OTTI losses not previously recognized | — |  |  | — |  |  | — |
Reductions due to sales / (recoveries) | (1,111 | ) |  | — |  |  | — |
Reductions due to change in intent or likelihood of sale | — |  |  | — |  |  | — |
Additions related to increases in previously recognized OTTI losses | — |  |  | — |  |  | — |
Reductions due to increases in expected cash flows | — |  |  | — |  |  | — |
End of period | $ | — |  |  | $ | 1,111 |  |  | $ | 1,111 |
Realized Gain (Loss) on Investments [Table Text Block] | Proceeds from sales of investment securities, realized gains and losses and income tax expense were as follows during the years ended December 31, 2018, 2017 and 2016 (in thousands):
| 2018 |  | 2017 |  | 2016
Proceeds from sales | $ | 13,152 |  |  | $ | 159,663 |  |  | $ | 70,757 |
Gross gains | 941 |  |  | 773 |  |  | 1,192 |
Gross losses | (40 | ) |  | (157 | ) |  | — |
Income tax expense | 261 |  |  | 216 |  |  | 465 |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following table presents the aging of gross unrealized losses and fair value by investment category as of December 31, 2018 and 2017 (in thousands):
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 16,095 |  |  | $ | (148 | ) |  | $ | 105,549 |  |  | $ | (3,087 | ) |  | $ | 121,644 |  |  | $ | (3,235 | )
Obligations of states and political subdivisions | 38,782 |  |  | (450 | ) |  | 42,741 |  |  | (1,390 | ) |  | 81,523 |  |  | (1,840 | )
Mortgage-backed securities: GSE residential | 81,435 |  |  | (1,150 | ) |  | 171,321 |  |  | (5,036 | ) |  | 252,756 |  |  | (6,186 | )
Total | $ | 136,312 |  |  | $ | (1,748 | ) |  | $ | 319,611 |  |  | $ | (9,513 | ) |  | $ | 455,923 |  |  | $ | (11,261 | )
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 19,683 |  |  | $ | (147 | ) |  | $ | 48,226 |  |  | $ | (1,380 | ) |  | $ | 67,909 |  |  | $ | (1,527 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 58,584 |  |  | $ | (540 | ) |  | $ | 47,972 |  |  | $ | (1,494 | ) |  | $ | 106,556 |  |  | $ | (2,034 | )
Obligations of states and political subdivisions | 42,618 |  |  | (769 | ) |  | 9,267 |  |  | (256 | ) |  | 51,885 |  |  | (1,025 | )
Mortgage-backed securities: GSE residential | 187,949 |  |  | (1,942 | ) |  | 22,609 |  |  | (518 | ) |  | 210,558 |  |  | (2,460 | )
Trust preferred securities | — |  |  | — |  |  | 2,548 |  |  | (345 | ) |  | 2,548 |  |  | (345 | )
Total | $ | 289,151 |  |  | $ | (3,251 | ) |  | $ | 82,396 |  |  | $ | (2,613 | ) |  | $ | 371,547 |  |  | $ | (5,864 | )
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 34,101 |  |  | $ | (525 | ) |  | $ | 14,540 |  |  | $ | (453 | ) |  | $ | 48,641 |  |  | $ | (978 | )
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table indicates the expected maturities of investment securities classified as available-for-sale presented at fair value, and held-to-maturity presented at amortized cost at December 31, 2018 and the weighted average yield for each range of maturities (in thousands):
| One year or less |  | After 1 through 5 years |  | After 5 through 10 years |  | After ten years |  | Total
Available-for-sale: |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 148,656 |  |  | $ | 49,993 |  |  | $ | — |  |  | $ | — |  |  | $ | 198,649 |
Obligations of state and political subdivisions | 23,282 |  |  | 89,930 |  |  | 78,294 |  |  | 1,073 |  |  | 192,579 |
Mortgage-backed securities: GSE residential | 622 |  |  | 160,900 |  |  | 137,150 |  |  | — |  |  | 298,672 |
Other securities | — |  |  | 2,010 |  |  | — |  |  | 364 |  |  | 2,374 |
Total investments | $ | 172,560 |  |  | $ | 302,833 |  |  | $ | 215,444 |  |  | $ | 1,437 |  |  | $ | 692,274 |
Weighted average yield | 2.57 | % |  | 2.83 | % |  | 2.93 | % |  | 3.10 | % |  | 2.80 | %
Full tax-equivalent yield | 2.70 | % |  | 3.14 | % |  | 3.34 | % |  | 4.14 | % |  | 3.10 | %
Held-to-maturity: |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 39,995 |  |  | $ | 29,441 |  |  | $ | — |  |  | $ | — |  |  | $ | 69,436 |
Weighted average yield | 1.76 | % |  | 2.08 | % |  | — | % |  | — | % |  | 1.90 | %
Full tax-equivalent yield | 1.76 | % |  | 2.08 | % |  | — | % |  | — | % |  | 1.90 | %
The weighted average yields are calculated on the basis of the amortized cost and effective yields weighted for the scheduled maturity of each security. Tax-equivalent yields have been calculated using a 21% tax rate. With the exception of obligations of the U.S. Treasury and other U.S. government agencies and corporations, there were no investment securities of any single issuer, the book value of which exceeded 10% of stockholders' equity at December 31, 2018.
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Table Text Block] |
|  | Amortized Cost |  | Estimated Fair Value
Available-for-sale: |  |  |  |
Due in one year or less |  | $ | 174,049 |  |  | $ | 171,938 |
Due after one-five years |  | 142,357 |  |  | 141,933 |
Due after five-ten years |  | 79,095 |  |  | 78,294 |
Due after ten years |  | 1,352 |  |  | 1,437 |
|  | 396,853 |  |  | 393,602 |
Mortgage-backed securities: GSE residential |  | 304,372 |  |  | 298,672 |
Total available-for-sale |  | 701,225 |  |  | 692,274 |
Held-to-maturity: |  |  |  |
Due in one year or less |  | 39,995 |  |  | 38,790 |
Due after one-five years |  | 29,441 |  |  | 29,119 |
Due after five-ten years |  | — |  |  | — |
Due after ten years |  | — |  |  | — |
Total held-to-maturity |  | $ | 69,436 |  |  | $ | 67,909 |
Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

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- Definition Tabular disclosure of available-for-sale and held-for-maturity securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27340-111563 + Details
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